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The full IUGG 2019 searchable scientific program is now online

H01 – Unsolved Problems in Hydrology (UPH)


Convener: Günter Blöschl (Austria)

Co-Conveners: Antonio Chambel (Portugal), Jeff McDonnell (Canada), Elena Toth (Italy)



The International Association of Hydrological Sciences (IAHS), in collaboration with the Hydrology Divisions of EGU and AGU as well as the IAH, have recently called for compiling a list of unsolved scientific problems in hydrology that would invigorate research in the 21st century ( The initiative has been motivated by David Hilbert’s (1900) unsolved problems which have greatly stimulated focused research in mathematics. In a public consultation process through on-line media, followed by two workshops and a consolidation phase, a large number of potential science questions were collated, prioritised and synthesised, which resulted in a set 50 Unsolved Problems in Hydrology. The purpose of this workshop is to

  • discuss this set of science questions and how they relate to each other, and to
  • discuss potential strategies of addressing them, including through activities of the IAHS, EGU, AGU and IAH.


The workshop will consist of a small number of invited contributions, pop-up contributions and plenty of time for discussions. Submissions of abstracts for pop-up contributions are invited that address either of the two focuses of the workshop.


H02 – Using Fingerprinting and Modelling Techniques to Explore Transfer and Connectivity in Catchment Sediment Systems


Convener: Adrian Collins (UK), Simon Pulley (UK)

Co-Conveners: Ian Foster (UK), Allen Gellis (USA), Paolo Porto (Italy)



Fine-grained sediment is increasingly recognised globally as one of the most pervasive water pollutants and plays a pivotal role in the redistribution of many additional contaminants. Given the resource demands of traditional empirical methods for exploring sediment sources, transfers and fate in river catchments, applications of both sediment source fingerprinting techniques and of computer simulation models have increased many fold. Such approaches elucidate key characteristics of sediment transfers across temporal and spatial scales but also provide insight into catchment connectivity as an underpinning control on landscape scale sedimentological behaviour. This symposium therefore seeks to review progress in this area and to capture case studies using either approaches in isolation or collectively.

H03 – Land Degradation Due to Natural and Anthropogenic Drivers: Impacts on Runoff, Soil Erosion and Sediment Yield at Multiple Scales


Convener: Paolo Porto (Italy)

Co-Conveners: Kazimierz Banasik (Poland), Sergey Chalov (Russia), Adrian Collins (UK), Michael Stone (Canada), Joris Eekhout (Spain)



Soil erosion by water is a serious environmental problem in many areas of the world. Its impact has traditionally been assessed in terms of soil degradation and loss of productivity, but recent years have also seen an increasing awareness of the off-site problems related to downstream sedimentation and water pollution, which are linked to more general environmental degradation. In this context, the occurrence of wildfires and the intensification of agricultural activities have increased pressure on land and water resources, resulting in different forms of soil degradation, of which soil erosion and associated sedimentation are the most important. The worldwide economic costs of agricultural soil loss and associated sedimentation downstream have been estimated at US $400 billion per year. In addition, as a result of climate change, world average soil erosion is expected to increase significantly. Indeed, climate change is modifying precipitation regimes such that drought periods and/or extreme rainfall events are becoming more frequent in worldwide agro-ecosystems. This will increase soil degradation risk and erosion magnitude threatening the sustainability of soil and water resources and food supplies. This increasing concern over problems of accelerated soil erosion and associated land degradation as well as offsite impacts and associated diffuse source pollution has emphasised the need for improved information on changing rates of soil loss in the context of key drivers and thus for reliable means of assessing soil erosion rates across agricultural areas. In order to address these requirements, this symposium seeks to assemble case studies or reviews of measurements of runoff and soil loss at multiple scales (plots and catchments) including those combining different strategies in order to assess the impact of natural and anthropogenic factors on land degradation for areas where variation in land use and/or climate change has occurred during the last 2-3 decades. Case studies using modelled projections of alternative environmental futures are also welcome.

H04 – Source, Transport and Fate of Cohesive Sediment in Aquatic Systems: Implications for Water Quality and Ecosystem Health


Convener: Michael Stone (Canada)

Co-Conveners: Adrian Collins (UK), Sergey Chalov (Russia), Paolo Porto (Italy)



The increasing decline of surface water quality has become a key management challenge for many government agencies globally and changes in water quality have been related to the increased availability and transfer of cohesive sediment in rivers. Cohesive sediment is widely recognized as a vector for the transfer of nutrients and contaminants through river systems and it can also degrade the ecology of riverine habitats. This symposium seeks to advance knowledge of the source, transport and fate of cohesive sediment in aquatic systems and its implications for water quality and ecosystem health by addressing topics such as flocculation, fine sediment gravel bed interactions, contaminant form and mobility as well as emerging cohesive sediment models designed to simulate contaminant transport and fate.

H05 – Tracers for Understanding the Sources, Pathways and Fate of Pollutants in the Hydrological Cycle


Convener: Christine Stumpp (Austria)

Co-Conveners: Przemyslaw Wachniew (Poland), Maki Tsujimura (Japan), Randy Slotler (USA), Giovanny Mosquera (Ecuador)



Water pollution is one of the biggest environmental challenges. Pollutants cause the worldwide deterioration of water resources and aquatic ecosystems. Assessment and mitigation of water pollution rely on identification of its sources and pathways and on quantification of the removal processes in groundwater and surface water environments. These issues provide a cross-disciplinary research challenge which can be addressed with the application of multiple artificial or environmental tracers, including isotopic, gaseous and ionic species for tracing water flow and transport through the hydrological cycle. Hydrological tracers are indispensable for understanding flow paths and dynamics of water flow in the subsurface, as well as of runoff patterns in catchments. Stable isotope signatures of pollutants (e.g. of N, C, B) can provide unique insights into their origin and processes resulting in their removal or transformation within the hydrological cycle. The integrative nature of information provided by tracers makes them suitable for the application in a wide range of spatial and temporal scales, from soil column to aquifers to large river catchments. Tracers are essential for the evaluation of lag times associated with pollutant transport through the groundwater system that is a crucial factor in the programmes of measures undertaken to improve water quality in catchments. Furthermore, tracer data are used for verification and calibration of conceptual and numerical models of hydrological systems. We invite contributions that demonstrate how environmental and artificial tracers improve the understanding of pollutant transport in in hydrological systems of any size and type.

H06 – Long-Term Spatiotemporal Evolution of Catchment Water Quality and Sedimentation


Convener: Xiaohong Chen (China)

Co-Conveners: Jean Nepomuscene Namugize (Rwanda)



Along with climate change and intensive human activities, the aquatic system in a catchment scale has been altered worldwide. While some are heavily polluted, thus endangering essential services such as clean drinking water, other water bodies still show incredible beauty and pristine conditions. Especially in developing countries, water pollution has often become the biggest obstacle in development of social economy. At the same time, water quality is steadily improving in some catchments mostly in developed countries. This symposium aims to deepen understanding on the internal factors and mechanism of long-term spatiotemporal evolution of catchment water quality, soil erosion and sedimentation. The aim of this symposium is to discuss what controls the long-term spatiotemporal evolution of catchment water quality and sedimentation, natural or social factors, e.g., climate change, economic level, population, management, technology or culture. Approaches to model and evaluate the impact of both natural and social factors on catchment water quality, soil erosion and sedimentation. What should and what can we do in a scientific and sustainable way to mitigate regional water pollution and soil erosion? What can we learn from experience and lessons in water pollution control and soil-water conservation?

H07 – Human-Water Interactions in Water Quality Models


Convener: Akhilendra Gupta (India)



It is increasingly recognised in hydrology that incorporating co-evolving human-water interactions is critical to understand the water cycle. Arguably, these interactions are even more important for water quality prediction. However, traditional modelling approaches are static and uni-directional. As a result, they overlook two-way feedbacks between water and society and fail to account for the interaction between human and water systems across global/regional/local scales (e.g. grey water production and use; water quality of return flows; interactions between drought and water quality). Contributions to this workshop are invited in which water quality models include human-water interactions, such as simulating how different human behaviours impact on river/lake or soil water quality. Contributions which also consider water quality monitoring systems to provide underpinning data to assess these modelling approaches are also welcomed.

H08 – Hydrology and Water Quality Contributions to the Water-Energy-Food Nexus?


Conveners: Kate Heal (UK), Wouter Buytaert (UK)

Co-Conveners: Jean Nepomuscene Namugize (Rwanda)



The water-energy-food (WEF) nexus is now widely-accepted and promoted as a framework for analysing interactions among different sectors regarding human activities and needs. Hydrologists are positioned to play a leading role in developing and implementing WEF approaches to address development and resource challenges. In particular, hydrologists can support a more holistic approach to WEF analysis to include not only the magnitude of water fluxes, but also water quality and the supporting services of ecological systems in order to balance human and ecological demands on the aquatic ecosystem. For instance, the potential of water of different quality to "cascade" through a service chain: cooling water of energy being used in agriculture; polluted water from agriculture being used for cooling. Contributions to this workshop are invited which provide case-studies of WEF nexus analysis, particularly with a hydrological and water quality emphasis, or provide theoretical advances in considering hydrology and water quality within the WEF nexus.

H09 – Water Quality in Operational Water Resource Management


Convener: Kate Heal (UK)



Water quality measurements, modelling and process understanding often inform indirectly water resource management decisions in combination with water quantity information and model outputs. With advances in technology and monitoring, these interactions are occurring increasingly in real-time. The aim of this symposia is to: (1) showcase research in which water quality directly inputs to operational water resource management and (2) reflect on ongoing experience to identify developments required in water quality monitoring and process understanding to strengthen incorporation of water quality into water resource management decision-making.

H10 – Quantifying Vulnerability and Human Impact on Urban Water Resources


Convener: Florent Barbecot (Canada), John Gibson (Canada)



Water demand arising from population growth and related urbanization has increased significantly over the past decades and will expand to levels never before seen in human history. Within this context, evaluating available surface water and groundwater volumes, renewal rates, water quality, and potability is a strategic societal issue, and generally allows the assessment of water resources sustainability and vulnerability. In disturbed environments such as urban areas, behavior of water has been found to be highly variable and subject to drastic water quantity & quality changes. Tracing and dating water to map short-term dynamics of the water cycle, water supply and wastewater systems, i.e. from years to days, is a major scientific challenge that requires development of reliable tracer methodologies. This symposium welcomes submissions describing both surface and groundwater studies applying a wide range of scientific approaches. Submissions utilizing bulk, elemental, and isotopic signatures of organic and inorganic matter are particularly welcome. We also encourage studies using new analytical techniques and novel methodological approaches.

H11 – Recent Advances in Peatland (Eco)Hydrology and Biogeochemistry


Convener: Pete Whittington (Canada)

Co-Conveners: Colin McCarter (Canada), Jonathan Price (Canada), Scott Ketcheson (Canada)



Peatlands cover about 15% of Canada’s land surface and globally store roughly a third of the terrestrial soil carbon. A greater understanding of peatland ecohydrological and biogeochemical processes is critical to understanding the role these systems may play in a warming climate. These peatland processes rely on complex interactions between hydrological, biological, and chemical processes; yet there remains a dearth of knowledge of the interactions of these processes in peatlands. The goal of the symposium is to bring together peatland scientists from across the world to share the most current knowledge about peatlands. We welcome all studies involving the hydrology, ecology, biogeochemistry, or combinations therefore, of peatlands in undisturbed and disturbed (e.g., drainage, resource extraction) systems, as well as laboratory or theoretical (e.g., modelling) experiments.

H12 – Coastal Hydrology, Hydrogeology, and Hydraulics in an Era of Unprecedented Change


Convener: Barret Kurylyk (Canada)

Co-Conveners: Christopher Russoniello (USA), James Heiss (USA)

Invited speakers: Clare Robinson (Canada), Makoto Taniguchi (Japan)



Current, unprecedented rates of global environmental change have drastic societal implications, including deleterious impacts on human water security. This is most evident along coastlines where population density is three times higher than in non-coastal settings, and where changing conditions in both marine and terrestrial settings converge. In 2017, the ‘Year of the Hurricane’, several hurricanes devastated the Caribbean and the United States. The storms caused hundreds of casualties and an estimated $500 billion in infrastructure and property damage. Although surface flooding due to such storms has dominated news headlines, coastal aquifers can also experience drastic salinity increases following storm surges due to infiltration of seawater. These effects on water quality in the subsurface outlast those in surface settings and are not as well understood. Also, concentrated coastal anthropogenic activity often contaminates aquifers and streams that discharge into and pollute coastal water bodies. Future conditions for coastal water resources and ecosystems will likely worsen due to climate change (sea level rise and storm surges) combined with the projected increases in coastal population density and human activity. This symposium will bring together topics in coastal hydrology, hydrogeology, and hydraulics that involve field, laboratory, and modeling efforts that explore water, heat, and chemical fluxes in these dynamic environments over a wide range of spatiotemporal scales. Potential topics include but are not limited to surface flooding, submarine groundwater discharge, coastal ecosystems, saltwater intrusion, benthic exchange, intertidal processes, coastal sediment dynamics, storm surge dynamics, biogeochemical cycling, and coastal management and policy.



H13 – Advancements in Modeling and Characterization of Aquifer


Convener: Corinna Abesser (UK)

Co-Conveners: Felipe de Barros (USA), Alberto Bellin (Italy), Aldo Fiori (Italy), Antonio Zarlenga (Italy)



Modeling flow and transport in aquifers poses significant challenges because of the general scarcity of data and information for developing effective models. Heterogeneity of natural formations is a strong controlling factor for transport of solutes and other agents in the subsurface environment, which is hard to fully characterize due to the constraints imposed by subsurface inaccessibility and the often-inadequate resolution of traditional exploration methodologies. Boundary conditions are also a significant source of uncertainty, often disregarded, in particular at large scales. Recent advances of in situ characterization techniques and modeling capabilities, both in term of model conceptualization and mathematical representation, opens new perspectives in assessing the status of groundwater resources at all scales, from local to global.

This symposium deals with new methodologies to better assess and predict, through characterization and modeling, the status of groundwater resources at all scales.  We seek contributions dealing with theoretical, methodological and application aspects of subsurface characterization and modeling the Earth critical zone, by using innovative approaches to assess, and possibly reduce, large uncertainty still plaguing simulation results.  Data assimilation and inference methodologies are other aspects of the modeling chain that are considered here, such as all aspects related to modeling in support to risk analysis and the evaluation of system resilience and capability to metabolize stressors. Besides characterization and modeling specifically tailored to subsurface water resources, we are interested in contributions dealing with parametrization of groundwater in meteorological and Earth system models. Analyses conducted at local, catchment and global scales are all welcome.

H14 – Sub-Seasonal to Seasonal Predictions: Skill and Limits for Decision-Based Forecasting


Convener: Harald Kunstmann (Germany)

Co-Conveners: Chris White (Australia), Koray K. Yilmaz (Turkey), Andy Wood (USA), Ilias Pechlivanidis (Sweden), Andrew Robertson (USA)



The continued development of sub-seasonal to seasonal (S2S) ensemble predictions – with forecast horizons ranging from ~10 days to several months and seasons ahead – provides new opportunities for improved and effective decision-making across sectors such as agriculture, forestry, transport, energy, health, insurance, tourism and infrastructure. This ICCLAS-led symposium, in partnership with the international HEPEX research and practice community (, will bring together scientists, operational forecasters, practitioners and decision-makers to discuss the latest developments in S2S hydrological forecasting and their application across the water management and disaster risk reduction sectors. This symposium invites abstracts from both the meteorological and hydrological forecasting communities that address the skill and application of S2S predictions from across the following topics:

  • Sources of predictability on S2S timescales, including large-scale climate variability and modes, weather regimes and dynamics
  • Methods for model skill improvement and uncertainty reduction, including ensemble generation design and improved modelling approaches and techniques
  • Evaluation of probabilistic climatic and hydrological forecasts, including ensemble verification and assessments of the limitations of S2S forecasting
  • Implementation of operational S2S hydrometeorological forecasting systems
  • Demonstrations of ‘seamless’ hydrological forecasting across S2S timescales
  • Development and use of decision-based hydrological forecasts for water resources management and disaster risk reduction activities
  • Creation of user-relevant climate and hydrological applications to address the needs of users and decision-makers, including community efforts


The aims of the symposium are to better understand and improve hydrometeorological predictability on S2S timescales, and to promote the dissemination and practical use of hydrological forecasts to enable user communities to take advantage of ensemble forecasts for decision-making. We particularly invite presentations from the WWRP/WCRP Sub-seasonal to Seasonal (S2S) project that utilise the newly established S2S database, and from the HEPEX research and practice community.

H15 – Short-Range Hydrometeorological Forecasting


Convener: Marie-Amélie Boucher (Canada)

Co-Conveners: François Anctil (Canada), Maria-Helena Ramos (France), Fredrik Wetterhall (UK), Vincent Fortin (Canada), Gokcen Uysal (Turkey)



Short-range hydrological forecasts (several hours to 10-15 days) provide crucial information for decision making based on unknown future hydrometeorological conditions. This may concern end users dealing with both risk assessment and water resources management, and involves several scales in time and space. A large number of operational applications may benefit from hydrological forecasting systems that issue reliable and accurate forecasts: flood warning, drought risk management, reservoir control, water use planning, hydropower production, etc.

This symposium is dedicated to address scientific developments in hydrological forecasting and uncertainty assessment for the needs of practitioners, decision- and policy-makers. The objective is to identify challenges and discuss solutions in implementing, using and communicating uncertain hydrological forecasts in operational practice.

The symposium will focus on:

  • How to efficiently pre-process and bias correct atmospheric forecasts for their use in hydrologic models?
  • How to produce reliable probabilistic forecasts of extremes in hydrology?
  • How to evaluate the quality and economic value of hydrologic forecasts in a manner that is meaningful to users and adapted to their decision-making contexts?
  • How to combine various techniques for reducing and estimating hydrologic predictive uncertainty (e.g., ensembles and/or multi-models, data assimilation, error correction, statistical post-processing)?
  • How to make efficient use of estimates of predictive uncertainty in practice?
  • How can users be more engaged in the definition and development of novel forecast products that meet their needs for warning time, accuracy and reliability?
  • What best practices can be identified when facing the challenges of transferring science into operational practice to respond to stakeholders and societal needs?
  • How to effectively communicate forecasts and forecasts uncertainty to users and decision makers?


The symposium is organized under the auspices of the HEPEX (, a community of practice in hydrological ensemble predictions, which was launched in 2004 to foster scientific developments necessary to improve the skill of probabilistic hydrological predictions and their use in operational contexts.



H16 – Floods: Processes, Forecasts, Probabilities, Impact Assessments and Management


Convener: Alberto Viglione (Austria)

Co-Conveners: Svenja Fischer (Germany), Bruno Merz (Germany), Andreas Schumann (Germany), Chris White (Australia), Salvatore Grimaldi (Italy), Paul Pilon (WMO), Abou Amani (UNESCO), Toshio Koike (Japan)



One main aspect of the direct socio-economic relevance of hydrology consists in its ability to predict or to forecast extreme flood events. Prediction refers here to the assessment of the probability of a value related to the flood (e.g., the maximum peak discharge during one event) to be exceeded, without specifying the time of occurrence. Forecast refers instead to a statement of the future development of a variable related to the flood with a specification of the time of occurrence. With regard to their impacts, floods play a very important role for the society in general and human beings living in flood prone areas in particular. Because of missing information and a short memory of harmful events in the past, the public awareness of floods is often insufficient and flood prevention and protection are insufficient in many parts of the world. Existing tools and methods for flood prediction and forecast may be outdated, as new problems have to be considered, e.g. by increases of:

  • uncertainties, caused by climate change,
  • risks resulting by the concentration of people and values in river valleys,
  • demand for more reliable and more complex hydrological data for flood design,
  • complexity of flood protection at the river basin scale, where one method may affect several others and so on.


The large variety of flood problems demands a concerted action of experts from different branches of hydrology. In this sense, this symposium could benefit from contributions from many IAHS- commissions, from their methodologies and tools, to provide a comprehensive view of the state-of-art in this field of research. It would be useful to bring experts together, to specify new developments in future research and last but not least, to increase the visibility of IAHS. In this sense, this call covers many aspects of floods, including processes of flood generation, the assessments of flood probabilities, regionalisation issues, flood forecasting and the need for impact forecasts and other economic aspects of risk management.

H17 – Advances in Snow Hydrology


Convener: Timothy Link (USA)

Co-Conveners: Melody Sandells (UK), Danny Marks (USA), Tobias Jonas (Switzerland), Alexander Gelfan (Russia), Elzbieta Czyzowska-Wisniewski, (USA)



The storage and release of water from seasonal snowcovers constitutes a critical component of the annual hydrological cycle in many parts of the world. Quantifying, understanding, and predicting the processes that control snow distribution and ablation dynamics provide ample research challenges, especially in complex mountainous terrain. The spatial distribution of snowcover and its physical properties is typically highly variable at the meter to the regional scale. Its dynamics are influenced by surrounding topography and vegetation that control accumulation and redistribution processes, as well as local micrometerological conditions that control snowcover energetics and ablation. Accurate modelling of snowcover dynamics requires methods to simulate a large range of physical processes that act and interact at a range of spatial and temporal scales. Advances in these areas are needed and relevant to develop improved tools for water managers concerned with floods, droughts, water supply, and/or hydropower generation.


This symposium will bring together experimental and modeling experts to address recent research in snow hydrology. We especially encourage contributions related to topics such as:

  • Novel measurement approaches for snowpack states and fluxes
  • Feedbacks between climatic and snow hydrological processes and patterns
  • Snow-vegetation interactions in complex terrain
  • Effects of climate variability and change, especially in the rain-snow transition zone
  • Impact of landcover changes on snow hydrology
  • Advances in modeling, including operational applications
  • Representing small scale variability in large scale modeling applications

H18 – Advances in Remote Observation Of Seasonal Snow


Convener: Tobias Jonas (Switzerland)

Co-Conveners: Jeff Deems (USA), Jessica Lundquist (USA), Danny Marks (USA), Maria-Jose Polo (Spain), Elzbieta Czyzowska-Wisniewski, (USA)



Seasonal snow represents an important freshwater resource and critically sets conditions for ecosystem functioning in cold regions around the world. Today’s remote sensing technologies not only enable the measurement of snow distribution across the landscape, but also the simultaneous characterization of terrain and vegetation canopy structure. These combined datasets have reached a level of detail that ultimately allows the study of snowcover dynamics and ecosystem feedbacks to understand the interactions of patterns and processes at exceptionally small scales. This symposium will bring together those working on data from remote sensing technologies such as laser scanners, radar, as well as RGB, thermal, and hyperspectral imagery with the aim of quantifying snow water resources, studying snowcover dynamics, and investigating interactions with atmospheric and ecohydrological processes.

H19 – Advances in Remote Sensing Hydrology


Convener: Yangbo Chen (China)

Co-Conveners: Christopher Neale (USA), Chris Hopkinson (Canada), Maria Polo (Spain), Gilles Boulet (France), Koray K. Yilmaz (Turkey), Kartic Bera (India)



Many advances have occurred in remote sensing and earth observation during recent decades and a new sub-discipline of Hydrology has emerged called Remote Sensing Hydrology. These advances are accelerated by the rapid development of satellite, internet and information technologies. These advances, by providing observation in space-time that were not available by traditional hydrological observations have enabled many hydrological science and engineering problems to be solved more effectively. Using remote sensing observation technology, hydrological variables can be monitored in near real-time and quantitatively estimated at high spatial resolutions over large regions. By assimilating these observations and variables, huge advances and potential are expected for improving hydrological modeling and predictions. This symposium aims to share the latest developments in remote sensing hydrology worldwide, discuss the challenges and possible solutions, and present future research and application directions. The following topics will be addressed but not limited to:

  1. Sensors and Systems. This subtopic will cover technologies, platforms and remote sensing products, used–or with the potential to be used –in hydrological remote sensing. Presentations on the latest international campaigns, initiatives and data products with relevance to hydrological remote sensing, such as GCOSECVs, GPM, SMOS, SMAP, GRACE(-FO),Sentinels, SWOT, SPoRT, etc. will be invited.
  2. Theories and methods. This subtopic focuses on the latest progress in theories and methods for a) Remote sensing monitoring and estimation of hydrological variables, including but not limited to water vapor and temperature, precipitation, snow pack and ice cover, evapotranspiration, soil moisture, groundwater, water body and flood inundation, river discharge, lake and sea levels, water pollution, etc. and b) Assimilation of remote sensing variables into hydrometeorological models, for example, parameter estimation, and updating state variables and fluxes that form an integral part of hydrometeorological modelling and predictions.
  3. Applications. This subtopic discusses the applications of remote sensing technology and products in hydrology, water resources, environment, ecosystems, flood monitoring and prediction, as well as climate human activity impact assessment and projections in water systems. Various hydrological tools based on remote sensing data will also be presented, such as distributed hydrological models.


Authors who present their work will be invited to submit a full paper for review, which if successful will lead to publication in an international refereed journal special issue after this symposium.

H20 – Predictions in Ungauged Basins: What’s New?


Convener: Thomas Skaugen (Norway)

Co-Conveners: Gil Mahe (France), Aldo Fiori (Italy), Nilay Dogulu (Turkey), Michelle Newcomer (USA), Honeyeh Iravani (UK)



Many problems related to predictions in ungauged basins (PUB) still remain open although great advances has been made since the launch of the previous scientific decade of IAHS. The topic remains highly relevant, necessary and inspiring and seems to focus the attention on key problems in scientific hydrology. The scope of hydrological estimates needed at ungauged sites broadens, and hydrological models are needed for estimates of classical hydrological quantities such as floods and low flow in addition to snow conditions, groundwater and evapotranspiration. Advances in PUB will hence greatly benefit many of the emerging issues to be addressed by the hydrologic community and many other scientific and societal communities in need of hydrological information. Contributions are invited to this symposium that address all aspects of predictions in ungauged basins, from classic regionalization strategies of model parameters to optimal use of available (new) information, new modeling concepts and model philosophies, including inputs from remote sensing and groundwater modeling.

H21 – Comparative Inventories Of Water Resources Systems and Their Functioning - Methodology and Tools for Their Assessment, Protection and Efficient Use


Convener: Barry Croke (Australia)

Co-Conveners: Zongxue Xu (China), Alberto Montanari (Italy), Giuliano Di Baldassarre (Sweden), Suxia Liu (China), Nishadi Eriyagama (Sri Lanka)



In high-income countries, the structural expansion of water management systems is in many cases discussed controversially. Often it is not on the agenda or plays only a minor role in water management planning. Emphasis is given to adapt existing water management systems to a changing environment, by modifying them technically, adapting their operation or even to remove them.

In contrast to this, structural measures are still the main choice in low-income countries. The utilization of non-structural methods to improve water supply and to reduce water demand are often hampered due to insufficient power to put plans, actions, or laws into effect. Under ongoing changes of socio-economic conditions and accelerated climate variability, which has increasing impacts on water resource systems, the interplay of structural and non-structural measures becomes an increasing relevance.

This requires an update of existing methodological tools and a widening of our view to differences between continents and countries. New experiences, technologies, and data could be a starting point for a re-thinking about the most suitable tools and methodologies, and to avoid a preference for traditional measures, which fail to reflect the actual complexities of water resources systems.

This symposium has the goal of providing a comparative inventory of water resources systems and to specifying the differences and similarities of methodologies and tools to solve current and future water problems. Key issues include, but not limited to:

  • Water management in data sparse regions: What new methodologies are available to fill the data gap for water resources system design, operation and management;
  • Adaptation of water resource systems (e.g. reservoirs, inter-basin transfer systems, irrigation systems) to changing environment: dynamic models including novel methods of water supply/demand management;
  • Non-stationarities in water management planning as a matter of time scales;
  • Evaluation of trade-offs between different water users, sectors and societal needs;
  • Environmental flows in low-income countries: methodologies for low cost assessments in master plans;
  • Consideration of environmental aspects - water uses for human society and ecosystems;
  • Impact of climate change and (changing) natural variability on the management of water systems;
  • Protection of water resources to enhance water use capacity: options, limitations and results;
  • Consideration of possible impacts of climate change and co-evolution with society on water resources systems in practice, including impact on migration, particularly in low-income countries;
  • New directions in water management and exchange of expertise in the framework of IAHS.
  • A number of questions raised in the recent “Unsolved Problems in Hydrology” discussion are particularly relevant to this symposium, for example:
  • How can we identify tipping points of hydrological systems (including water resources systems) due to changes in climate and/or human impacts?
  • How do we adapt hydrological models to be able to extrapolate to changed conditions?
  • What is the role of water in the establishment and collapse of ancient civilizations and the implications for contemporary water management?
  • How to extract information from available data on human and water systems in order to inform the building process of socio-hydrological models?
  • How can we convincingly put a value to hydrological observation systems with open data to reverse the current trend of decline of observation systems?
  • What tools/techniques can be used to better package the science of hydrology (including uncertainty) to decision makers and the general public?


Papers addressing these questions, and related to surface and groundwater systems (considering water quantity and/or quality), and the co-evolution with society are particularly welcome. The symposium will bridge the gap between theory and practice by meaningful case studies provided by scientists to demonstrate the applicability of new methods and a critical review of practitioners to show their requirements for appropriated scientific solutions for their problems.



H22 – Time Series of Remote Sensing Data in Water Management


Convener: Benjamin Mewes (Germany)

Co-Conveners: Maria Jose Polo (Spain), Andreas Schumann (Germany), Kartic Bera (India)



In the decade, the availability of temporal variable remote sensing data has been increased significantly. Several IT-platforms provides large data sets for low costs and open-source software libraries ease the access to machine-learning and state-of-the-art WebGIS applications. Recently developed technologies like machine-learning allow the investigation of large data sets especially in data-sparse regions and could further ameliorate the benefit drawn from the available data. This results in a faster transition from scientific research to end-user application. However, the utilization of such data repositories requires specific technical skills and technologies. The cost-benefit ratio of these data for practical purposes are still uncertain for potential users.In this workshop, the availability of such data, the additional gains of their use, the technical requirements and the existing limitations for operational water management issues will be discussed. Typical applications are e.g. assessments of snow conditions, estimation of the water contents in reservoirs, assessments soil moisture conditions, water stress assessments for vegetation, inundation mapping and several others.  At the workshop, practical examples of the operational use of time series of such data, provided by remote sensing in water management, and the coherently developed data-driven modelling and analysis approaches should be presented to demonstrate the scientific and technical opportunities and to raise the interest of practitioners for such technologies.


H23 – Innovative ICT Tools for Water Management and Science


Convener: Laura Foglia (USA)

Co-Conveners: Berit Arheimer (Sweden), Andrea Brookfield (USA), Mary Hill (USA), Rudy Rossetto (Italy), Melody Sandells (UK)



The importance of developing innovative Information and Communication Technology tools has been recently widely recognized in both water management and open science. The needs of including the stakeholders (water providers, customers, policy makers, scientists) in the full water management decision process (from model development to decision making) has become more evident. As an example, the European Union specifically supports participatory approaches and evidence-based decision making in water resources management (see e.g. the ICT4Water cluster). In parallel, user-driven virtual water-science laboratories are being developed to encourage more openness in science. The aim is to facilitate sharing of new findings earlier in the discovery process, and to ensure reproducibility of computational experiments.

This symposium encourages contributions from all over the world where advanced ICT tools have been either developed or applied in an innovative way to support stakeholder involvement and discussion, either for water resources management decisions or news forms of research. The expected ICT tools presented can include:

  • Development and experience from using new hydrological software to facilitate water management or research
  • Innovative ideas on how to enhance participation in water resources management or virtual water-science laboratories (for example, innovative web-applications).
  • Data sharing solutions to facilitate data exchange between researchers, stakeholders, and policy makers.
  • ICT tools to better connect different water sectors, such as the well-known water-food-energy nexus.
  • ICT tools to overcome geographical distance between scientists in comparative hydrology and to share joint protocols for model inter-comparison projects.
  • ICT tools to communicate what water and other natural resources mean to people in terms of survival, economics, beauty and enjoyment.



H24 – Modeling Hydrological Processes and Changes Under a Changing Environment


Convener: Jianzhong Zhou (China), Yangbo Chen (China)

Co-Conveners: Marco Borga (Italy), Hafzullah Aksoy (Turkey), Alexander Gelfan (Russia), Alberto Viglione (Austria), Gil Mahé (France), Harald Kunstmann (Germany)



Hydrological processes have been changing due to the dual impacts of climate changes and human activities, and modeling the hydrological processes and changes has long been the goal of the global hydrological communities. Challenges still exist, such as lacking effective models and in-situ observation data, uncertainties related to climate change prediction and human activities estimation and monitoring. This symposium aims to discuss these challenges, propose solutions and report latest progression modeling the hydrological processes and changes of world river systems and urban areas. Topics to be addressedbut not limited to are urbanization and climate changes in the past and future decades at city, watershed, regional and global scales; observation and simulation of hydrological processes and changes at different time-space scale in different climate zones, including snow, precipitation, evapotranspiration, surface water, soil water, underground water, flood and drought, case studies in large rivers and greater urbanized areas are particularly welcome; hydrological models and tools, uncertainties associated and the controlling methods; hydrological response changes induced by climate changes, or/and human activities. Special issues on internationally refereed journals will be produced based on the presentations after this symposium.


H25 – Quantifying Uncertainty in Hydrological Systems: A Bayesian Point of View


Convener: Dmitri Kavetski (Australia)

Co-Conveners: Jasper Vrugt (USA), Mark Thyer (Australia), Lucy Marshall (Australia), Elena Volpi (Italy)



Past decades have seen a flurry of activity in Bayesian applications in hydrology. These applications include those to quantify model and parameter uncertainty, develop alternatives to reduce structural uncertainty through sensible averaging procedures, to new alternatives of defining uncertainty by relaxing the framework for specifying model likelihoods. Additionally, hydrologists are starting to adopt data assimilation as a new way to both reduce predictive uncertainty, and also to assess where assumed model structures may not be fully adequate. This symposium invites contributions involving new and innovative ways of using Bayesian methods for the type of hydrological problems mentioned above, as well as other emerging problems that such techniques have been put for use in.

H26 – Hydrologic Time Series with Contributions on Methodologies, Applications, Assessment and Alternatives for Nonstationarity, and Assessment of Uncertainty


Convener: Saman Razavi (Canada)

Co-Conveners: Demetris Koutsoyiannis (Greece), Krzysztof Kochanek (Poland), Seth Westra (Australia), Ebru Eris (Turkey), Yuanfang Chen (China), Dong Wang (USA), Uwe Haberlandt (Germany), Alin Carsteanu (Mexico), Elena Volpi (Italy), Hafzullah Aksoy (Turkey)



Stochastic hydrology offers very efficient tools for the characterization of the relevant processes in hydroclimatic systems, e.g., for hydrologic design, hydroclimatic systems modeling and forecasting and water resources management. The application of the theory of stochastic processes is needed to achieve a faithful and consistent representation of natural processes and characterize the inherent uncertainty in probabilistic terms. This allows, e.g., to simulate synthetic series representing the relevant characteristics of the processes – the main statistical properties across multiple spatial and temporal scales – for assessing the hydrological impact in a changing environment, where change might be due to human intervention (e.g. in river basins) or to climatic variability.

This symposium call for papers developing and discussing stochastics tools to systematically deal with uncertainty and change and space-time variability, for simulation or disaggregation purposes of hydroclimatic variables such as, e.g., precipitation, temperature, streamflow and soil properties. Contributions are invited, for instance, on the improvement of stochastic modeling in hydrology, innovative techniques for identifying model structure, calibrating parameters, assessing uncertainties etc.


H27– Multivariate Statistics for Hydrological Application


Convener: Fateh Chebana (Canada)

Co-Conveners: Taha Ouarda (Canada), Andras Bardossy (Germany), Amir AghaKouchak (USA), Salvatore Grimaldi (Italy)



The statistical description of natural events frequently needs a joint modeling of several random phenomena. In the last ten years a significant improvements of multivariate statistical tools opened the venue to new application and analysis of hydrological data. Copula function is one example, indeed it allows to model several continuous random variables, independently of their marginal distributions, and since its development new hydrological design procedures were introduced and new interesting studies on drought, rainfall, runoff, and regional studies were possible.

The purpose of this Workshop is to collect contributions on spatial, temporal and other multivariate statistical techniques and their use for the improvement of hydrological modelling.

H28 – Contributions on the Unsolved Problems in Statistical Hydrology


Convener: Ashish Sharma (Australia)

Co-Conveners: Elena Volpi (Italy), Salvatore Grimaldi (Italy), Yuanfang Chen (China), Ebru Eris (Turkey), Krzysztof Kochanek (Poland)



The IAHS solicited contributions to identify 23 unsolved (but solvable) problems in hydrology that would revolutionize research. As part of this initiative, STAHY contributed three such problems. These were, (a) how to identify the independent factors effecting a nonlinearly evolving hydrologic response? (b) how to identify an optimal dimension to use in multivariate hydrologic analysis using Copulas? And, (c) how could we detect and attribute change in flood characteristics (or any extreme valued random variable that is impacted by multiple factors)? This symposium invites contributions that help illuminate the uncertainties surrounding the above three questions, ranging from simple illustrations of traditional approaches that have been used for each, to new ideas or frameworks that could be developed that may ultimately lead to these changing to “Solved”.  Additional contributions on problems independent of the three listed above, but those that fall into the “Unsolved” categories, are also welcomed.

H29 – Water-Related Education, Training and Capacity Development: Revisiting the Scopes and Competencies


Convener: Christophe Cudennec (France)

Co-Conveners: Valérie Borrell (France), Claudio Caponi (WMO), Anil Mishra (UNESCO), Vladimir Smakhtin (UNU), Eric Servat (France)



Initial and life-long education, training in operational services, and capacity development within institutions and society are actually facing many challenges in the water-related fields: changes in hydrology and water issues imbedded in the wider environmental and societal changes; evolution of techniques from monitoring and modelling to supporting stakeholders’decisions and the society at large; dealing with synergies and tradeoffs in the perspectives of security and sustainable development… This workshop welcomes conceptual developments as well as practical/experimental study cases addressing questions such as:

  • Are we producing the right type of water specialists?
  • How to assess whether the curricula are adapted to the needs of the current and future challenges?
  • Does the current system of water degrees match with the needs of development frameworks – i.e. SDGs, Sendai, Paris Agreement  … ?
  • How to blend hydrological approaches with understanding of global development processes, business, communication, practice?
  • How to develop agility regarding change and innovation?
  • Are we shaping and blending accurate on-line resources and learning modalities, including provision of required skills and values?
  • Are the transitions quick enough?
  • How do we ensure developing countries are not left (even more) behind?
  •  …


Experiences with the competency approach are encouraged to see how this method is and can be used in our field to tackle the challenges: providing frameworks for designing and renovating modalities and curricula; offering life-long reflexivity and progress opportunities; accomodating and developing innovations; improving the position and efficiency of hydrologists and water-related managers in societies in transition.

Other cryosphere related symposia led by other associations

  • C02 – Remote Sensing of the Cryosphere - Into an Era of High-Repeat Rate Time Series

    Convener: Liss M. Andreassen (Norway)

    Co-Conveners: Andreas Kääb (Norway), Leigh A. Stearns (USA)



    The number of aerial and satellite remote sensing platforms and sensors have grown significantly in recent years. New satellite sensors such as Sentinel and Planet as well as the increasing use of unmanned aerial vehicles open possibilities of using dense time series for exploring the cryosphere. In this symposium, topics include but are not limited to:

    • Cryosphere studies that use time-series from single sensors or by integrations of sensors;
    • Methodology that relies on cloud-based platforms (e.g. Google Earth Engine, Amazon Web Services);
    • Classification schemes (for terminus position and outline mapping, iceberg detection, snow cover, sea ice extent) that rely on machine learning algorithms;
    • Integrating remote sensing and field-based observations to combine spatial and temporal investigations.


    > Visit the IACS symposia


  • C07 – The Hydrological Cycle at High Latitudes: Variability, Changes and Impacts on the Cryosphere

    Convener: Amaelle Landais (France)

    Co-Conveners: Irina Gorodetskaya (Portugal), Takashi Yamanouchi (Japan)



    The atmospheric water cycle is a key player in the ice sheet surface mass and energy balance. The rapid changes associated with the anthropogenic warming are expected to alter this balance, with changing in poleward moisture transport affecting the precipitation rate, cloud properties, albedo, and consequently mass and energy balance.

    In this symposium, we welcome contributions both from modeling and from observational campaigns using a combination of remote sensing, ground/ship-based and satellite observations targeting various aspects of the hydrological cycle in the polar regions and improving their representation in climate models.

    Topics can include but are not limited to:

    • Atmospheric dynamics, including the role of atmospheric rivers in the total precipitation budget in the Arctic and Antarctic
    • Water isotope measurements in the vapor, as a new constraint on moisture transport in models.
    • New observation techniques to improve precipitation estimate and the surface mass balance
    • Impacts on the surface energy balance, including clouds, albedo and melt
    • Interaction with the ocean, from air-sea fluxes to the role of precipitation in the ocean salinity changes.


    > Visit the IACS symposia


  • C11 – Towards the Development of a World Snow Centre of Excellence?

    Convener: Charles Fierz (Switzerland)

    Co-Conveners: Ross Brown (Canada), Masahiro Hori (Japan)



    Characteristics of the snow cover like depth, water equivalent, extent, stratigraphy, etc. as well as depth of snowfall are routine measurements from a range of in situ and remotely sensed methods with widely varying time and spatial scales. These data are used in a broad range of applications including real-time weather and hydrological forecasting, evaluation of snow process models, ecological studies, and climate monitoring. There are a number of challenges using these data: (1) measurement procedures (best practices) are neither consistently applied nor harmonized; (2) data curation is rudimentary in particular with respect to in situ long term snow observations, and (3) the error characteristics of all kinds of snow cover products are often not specified. Tackling these problems requires a focused effort to mobilize the scientific community and operational services. There is currently significant interest in establishing a World Snow Centre of Excellence as an independent, internationally recognized leader both in snow science and operational snow monitoring to develop observing standards, to improve seasonal forecasting products, to validate new snow products, and to compare new generation snow-cover models. We thus invite contributions on, but not limited to the following topics to assist in the thinking of the need for, and the roles and activities of a World Snow Centre of Excellence:

    • In situ snow cover monitoring networks and activities
    • Global snow cover products and validation activities
    • Evaluation of snow-cover models
    • Analysis of snow cover variability and change


    > Visit the IACS symposia



  • JH01 - Scientific Inputs to Water-Related SDGs of the Agenda 2030  (IAHS, IAMAS)

    Convener: Christophe Cudennec (France, IAHS)

    Co-Conveners: Johannes Cullman (WMO), Maria Donoso (UNESCO), Stefan Uhlenbrook (WWAP), Vladimir Smakhtin (UNU), Nilay Dogulu (Turkey, IAHS)



    The United Nations member states adopted the Agenda 2030 in September 2015, structured into 17 Sustainable Development Goals – SDGs. The transformative process towards 2030 is ambitious, complex and holistic. Science has to contribute through different ways of understanding, quantifying and exploring processes, interdependencies, innovations, and procedures. This requires handling a specific data-indicator-(dis-)aggregation-displaying chain, addressing new scientific questions, articulating knowledge and disciplines, quantifying change, assessing coevolution and interfaces, supporting foresight and political decisions…

    SDG6 is dedicated to water. Many intra-SDG6 linkages between targets, and many inter-linkages with other SDGs are identified. There exists a huge diversity through the hydrological, the sociological and institutional, and the methodological heterogeneities across geography and scales. The States and UN Agencies are assessing the actual baseline, and setting up the arrow of indicators. A first Synthesis report was issued in July 2018 to feed the UN High Level Political Forum. Specific reports were issued in August 2018 on indicators (see A data portal will be launched at the end of 2018. These shall support actions and progress monitoring in the coming years. The whole is further enhanced by the 2018-2028 Decade for action on water, launched on 22 March 2018. It is time to call the scientific community to look at the status, data and process; and to elaborate further analyses and methods, bridge gaps, and support action. This symposium welcomes inputs to topics like:

    • Explicit and direct contributions of hydrological and related geophysical sciences to quantifying SDG indicators;
    • Regional / national contributions from hydrology and water resources to national SDG6 and other related SDGs;
    • How the UPH – Unsolved Problems in Hydrology contribute to the societal water agenda and SDGs (;
    • How the data initiative of HLPW can contribute and be further enhanced by researchers (;
    • How hydrological research can intensify the progress of the Water decade (;



  • JH02 - Climate and Hydrological Services: Bridging from Science to Practice and Adaptation (IAHS, IAMAS, IAG)

    Convener: Chris White (Australia, IAHS)

    Co-Conveners: Co-Conveners: Harald Kunstmann (Germany, IAHS), Berit Arheimer (Sweden, IAHS), Neil Holbrook (Australia, IAMAS), Laurent Longuevergne (France, IAG), Johannes Cullman (WMO)



    With climate change and decreasing water availability per capita being one of the crucial challenges for society in the 21st century, there is the urgent need to develop and initiate adaptation measures. The provision of state of the art climate- and hydrology information for services has been initiated for different regions worldwide in order to approach the manifold demands of stakeholders, particularly in water management, agriculture, energy production or civil protection. This symposium invites for abstracts that address the challenges faced in both climate- and hydrological service provision when bridging from science to practice and finally to the derivation of adaptation measures. This comprises particularly contributions on 1) provisions of high-quality real-time and historical data from national and international databases, 2) hydrometeorological forecasts and particular subseasonal to seasonal predictions, 3) high resolution downscaling efforts of global climate scenarios, 4) development of bias-correction techniques for provided hydrometeorological fields, 5) solutions for digital and open data access, 6) development of methods to overcome limitations due to limited observation data density or –quality, 7) efforts to improve structure and parameterization of models, 8) improved ways to communicate scientific results and uncertainty to decision makers to increase chances of uptake, 9) examples and descriptions of case studies and initiatives worldwide, including the role of local and national legislations that help the adaptation process.


  • JH03 - Geosciences in the Anthropocene: Observing and Modelling Human-Nature Interactions in a Changing World (IAHS, IAMAS)

    Convener: Giuliano di Baldassarre (Sweden, IAHS)

    Co-Conveners: Veena Srinivasan (India, IAHS), Tobias Krueger (Germany, IAHS), Kei Yoshimura (Japan, IAMAS)



    This symposium welcomes abstracts that consider how to observe, model and analyse interactions of human and environment systems, and the effects of socio-economic trends and environmental change. It is organised as part of the IAHS Panta Rhei hydrological decade 2013-2022.

    The symposium focuses on advancing our understanding (and developing models) of dynamics produced by the mutual shaping of social and physical processes.

    Examples of relevant areas include:

    • Inventories of geoscience research in human-impacted systems.
    • Observations of human impacts on, and responses to, environmental change.
    • Interactions of communities with natural resources.
    • Geophysical and hydrological models that include anthropogenic effects.
    • Data analyses and comparisons of coupled human-environment systems around the globe and especially in developing and emerging countries.
    • Human interactions with extreme events, i.e. floods, droughts, and landslides.



  • JH04 - MOXXI: Innovation and Multidisciplinarity to Observe Earth Processes (IAHS, IAMAS)

    Convener: Flavia Tauro (Italy, IAHS)

    Co-Conveners: Piet Stammes (Netherlands, IAMAS), Andy Wickert (USA, IAHS), E. Mario Mendiondo (Brazil, IAHS), Dominique Bérod (WMO)



    According to recent surveys in hydrology, traditional monitoring systems and challenges in maintaining current monitoring networks are a significant bottleneck to the comprehension of natural processes. Specifically, standard observational equipment is expensive, offers limited spatial (and often temporal) coverage, mandates access to trained staff and resources, and involves high costs.

    In this vein, the International Association of Hydrological Sciences has supported the foundation of the Measurements and Observations in the XXI Century (MOXXI) working group with the aim to promote the advancement of novel observational techniques, leading to new sources of information to help better understand the hydrological cycle. The group’s interests revolve around the following pillars:

    • Process understanding is enhanced when scientists proactively design and develop their measurement tools and methodological approaches by adjusting them to answer their specific questions.
    • Successful observational approaches often rely on knowledge from other fields of science.
    • Innovative measurement systems may entail a DIY approach, using low-cost and unintended instrumentation, and/or performing smart (opportunistic) observations.


    For instance, precipitation has been measured with moving cars and accelerometers, and water levels have been monitored with game-console remote controls.


    This symposium encourages scientists from all realms of geodesy and geophysics to share their innovative ideas to observe Earth processes. Scientists that build their own instruments and/or use existing equipment in innovative ways are highly encouraged to present their approaches and solutions to fellow researchers.


    Contributions will address the key issue of providing accurate and reliable measurements at different spatial and temporal scales, in ungauged sites, and in challenging environments.


  • JH05 - Citizen Science and Crowdsourced Data in Hydrology for Water Risk Management, Communication and Awareness (IAHS)

    Convener: Fernando Nardi (Italy, IAHS)

    Co-Conveners: Jan Seibert (Switzerland, IAHS), Woutert Buytaert  (UK, IAHS), Hongchao Fan (China, IAHS), Wahrmann Vargas Cristina (Costa Rica, IAHS),  Anil Mishra (UNESCO), Dominique Bérod (WMO)



    Citizen involvement in research and scientific projects have been transformed in the last decade by new and largely accessible sensing and data processing tools. Geospatial technologies and low cost equipment (smart phones, cameras, drones, …), allow students, researchers and citizens to gather, analyze, visualize and share a wealth of hydrologic and earth system data at different spatial and temporal scales. New opportunities are, thus, arising for addressing the uncertainties and inaccuracies of water resource and risk management models, for a better understanding, monitoring and forecasting of hydro-extremes. Citizen science is supporting a new paradigm for hydrology where active citizenship and crowdsourced data have a pivotal role for risk mitigation, communication and awareness. This transition requires multi-disciplinary and trans-sectorial knowledge, analytical approaches and data processing methods, spanning from earth-, geo-, hydro- sciences to humanities, social and communication sciences, to synergically define the guidelines and procedures that support effective use of informal human-sensed data for water resource and risk management. This symposium seeks contributions on data, tools, methods and procedures that explore the role, value and performances of citizen science for hydrologic and earth science research and projects.


  • JA02 - Geophysical Data Assimilation (IAGA, IACS, IAG, IAHS, IAMAS, IAPSO, IASPEI, IAVCEI)

    Convener: Sabrina Sanchez (Germany, IAGA)

    Co-Conveners: Marie Bocher (Switzerland, IASPEI), Matthias Morzfeld (USA, IAGA/IAMAS), Takemasa Miyoshi (Japan, IAMAS), Entcho Demirov (Canada, IAPSO), Julien Brajard (France, IAPSO/IACS), Salvatore Grimaldi (Italy, IAHS), Pavel Novak (Czech Republic, IAG)



    Data assimilation has become a valuable tool for improving our understanding of the Earth and its different dynamical layers, such as the core, mantle, oceans, atmosphere and magnetosphere. By merging sparse observations, complex physical models and their respective errors, data assimilation attempts to unveil hidden features of a given system as well as predicting its evolution. Although its long-term development in the field of meteorology has led to a well-established framework, data assimilation methodologies still bear considerable challenges. Amongst those we can cite the numerical stability of ensemble-based methods such as the Ensemble Kalman Filter, the identification and handling of model errors and biases, the hybridization of variational and sequential approaches, and the usage of multi-model ensembles for parameter estimation. Moreover, in many fields of application, such as core and mantle dynamics, as well as volcanism and space weather, data assimilation remains fairly exploratory. However, these novel applications can provide a platform for further analysis of the aforementioned challenges. This symposium aims at promoting a constructive dialogue between the different geophysical communities with a shared interest in the development of innovative strategies in data assimilation. We therefore particularly encourage the participation of contributions connected to emerging research fields of geophysical data assimilation, as well as the development of libraries, testbeds and computationally efficient data assimilation schemes.


    > U03


  • JA07 - Geoscience Data Licensing, Production, Publication, and Citation (IAGA, IACS, IAG, IAHS, IAMAS, IAPSO, IASPEI, IAVCEI)

    Convener: Masahito Nosé (Japan, IAGA)

    Co-Conveners: Simon Flower (UK, IAGA), Yasuhiro Murayama (Japan, IAMAS), Helle Pedersen (France, IASPEI), Attilio Castellarin (Italy, IAHS), Gabriel Guimarães (Brazil, IAG), Toru Suzuki (Japan, IAPSO), Aude Chambodut (France, UCDI), Giuseppe Puglisi (Italy, IAVCEI)



    A number of national and international geoscience research infrastructures have been created in recent years, for example, EPOS (the European Plate Observing System), Copernicus (European Union's Earth Observation Programme), IUGONET (the Inter-university upper atmosphere global observation network), EarthCube (the ‘system of systems’ infrastructure for geosciences) and AuScope (the Autralian geoscience and geospatial infrastructure). At the same time the World Data System is evolving and certification of data repositories (ICSU-WDS, CoreTrustSeal) is becoming an important concern. Together these initiatives make it possible for users to easily access huge archives of disparate geoscience data and metadata in a secure and reliable manner, a task that was complex and time consuming before these initiatives were available.


    Clear licensing of geoscience data gives users clarity over how they can use and share the data, protects the rights of data providers and promotes integrated research. Data publication and citation will benefit data suppliers by giving them proper credit, professional recognition and rewards for their works, in a similar manner to the way that publication of scientific results benefits scientific researchers. Licensing, publication and citation of data are becoming a requirement for contribution to geoscience infrastructures. The system of licensing, producing, publishing, and citing of geoscience data is a structure for persistent intellectual content identification and management as well as for connection of users with content suppliers.


    This symposium solicits contributions presenting actual practices and future plans of data licensing, producing, publication, and citation of scientific data, and possible related topics.


  • JA12 - Innovation in Geoscience Education, Outreach and Citizen Science (IAGA, IAHS, IAPSO, IASPEI)

    Convener: Manoj Nair (USA, IAGA)

    Co-Conveners: Rick Saltus (USA, IAGA), Edgar Bering  (USA, IAGA), Barbara Leichter (Austria, IAGA), Christophe Cudennec (France, IAHS), Isabelle Ansorge (South Africa, IAPSO), Laura Gallardo (Chile, IAMAS), Raju Sarkar (Bhutan, IASPEI), Paul Denton (UK, IASPEI), John Taber (USA, IASPEI),



    This Symposium calls for papers describing innovations in geoscience instruction methods and citizen science initiatives. Papers are welcome describing advances in all levels of instruction, including secondary and higher education. We are particularly interested in papers about inventive approaches to inquiry-based learning in all geosciences. Involving students and the public in designing experiments and collecting data has been shown to foster a scientific identity, to increase overall interest in science, and to improve the perceived value of scientific research. Papers are welcome on all aspects of education and citizen-science including methodology, data-collection, non-traditional areas of curriculum, case studies, etc. In particular we invite contributions that describe ways to broaden the public understanding and appreciation of science and to attract non-traditional and under-represented students into the sciences.


  • JC04 – Declining Glaciers and Snow Cover and Their Impacts on Downstream Hydrology (IACS, IAHS)

    Convener: Regine Hock (USA, IACS)

    Co-Conveners: Danny Marks (USA, IAHS), Alexander Gelfan (Russia, IAHS)



    As glaciers and snow cover decline, significant changes in the hydrological regime and biogeochemical properties of streams are expected in catchments with glacier or snow cover. This symposium focuses on new insights into relevant processes, new observational evidence of ongoing changes, as well as advances in our ability to model future runoff in ice and snow-covered basins on all scales from the local to the global scale. Topics include but are not limited to (a) the impacts of glacier and snow cover changes on runoff amounts and seasonality, physical and biogeochemical properties of stream water, and hydrological pathways, (b) trends in river runoff in glacier and snow affected catchment and their causes, and (c) snow-glacier-climate-runoff feedbacks and related physical processes, including the effects of black carbon/aerosols and changing atmospheric drivers on glacier and snow melt runoff.

  • JC05 – Climate Change Impacts on Arctic Snow, Permafrost, Lake and River Ice (IACS, IAHS)

    Convener: Chris Derksen (Canada, IACS)

    Co-Conveners: Homa Kheyrollahpour (Canada, IACS), Alexandrew Langlois (Canada, IACS), Richard Kelly (Canada, IACS), Claude Dugauy (Canada, IACS), Andrei Kalugin (Russia, IAHS)



    The terrestrial cryosphere in the Arctic is undergoing rapid change, evident in shorter snow cover and lake ice duration, changing ice regimes and discharge in northern flowing rivers, warming ground temperatures, decreasing ground ice content, and increasing active layer thickness. These changes have inter-connected impacts on, and feedbacks with, energy and freshwater budgets, vegetation dynamics, the carbon cycle, and aquatic and terrestrial ecosystems. Determining the inter-connected nature of changes to the terrestrial cryosphere, and the ability of climate models to simulate future change pathways will improve understanding of the impacts of climate change on the Arctic.

  • JC08 – Coupling Processes Between the Atmospheric Boundary-Layer and Snow/Ice Surfaces: Observations and Modelling (IACS, IAHS, IAMAS)

    Convener: Vincent Vionnet (Canada, IACS)

    Co-Conveners: Ruzica Dadic (New Zealand, IACS), John Pomeroy (Canada, IAHS), Tobias Jonas (Switzerland, IAHS), Rebecca Mott (Switzerland, IAMAS), Ethan Gutmann (USA, IAMAS)

    Invited Speakers: Jessica Lundquist (USA), Kouichi Nishimura (Japan)



    The symposium addresses fundamental exchange mechanisms of mass and energy between the cryosphere, vegetation and the atmospheric boundary layer in snow-covered regions. The interaction between the near-surface atmosphere and the cryosphere can lead to significant spatial and temporal variations of momentum, mass- and energy exchange as well as complex atmospheric flow patterns that are modulated by complexities in topography and vegetation cover. These processes strongly affect the evolution of seasonal snow cover, permafrost, sea ice, vegetation and glaciers and drive snow and ice hydrology.

    We invite contributions on, but not limited to, the following topics:

    • treatment of turbulent fluxes over snow in models and measurements
    • advection of energy to snow-covers and glaciers and impact on snow and ice melt
    • orographically-induced precipitation and preferential deposition of snowfall
    • wind-induced snow transport and associated sublimation
    • impact of vegetation on snow/atmosphere interactions
    • Studies in level and mountainous terrain are welcome. We particularly encourage abstracts that propose advances in a) modelling techniques to represent the physics of coupling the atmospheric boundary layer to snow and ice surfaces and b) observational techniques to explore these complex coupling processes.


  • JG03  - Near-Real Time Monitoring of Regional to Global Scale Water Mass Changes (IAG, IAHS)

    Convener: Adrian Jäggi (Switzerland, IAG)

    Co-Conveners: Rodrigo Abarca Del Río (Chile, IAG), Andreas Güntner (Germany, IAHS), Augusto Getirana (USA, IAHS), Fabrice Papa (France, IAHS)



    Changes in continental water storage (liquid water, snow or ice) control the regional water budget, are fundamental for assessing water resources, and may trigger hydrological extreme events (floods and droughts) that often claim a high toll on infrastructure, economy and human lives. Satellite gravimetry such as the past GRACE mission and the currently operating GRACE Follow-On mission (GRACE-FO) has been shown to be a unique monitoring concept to describe large-scale water storage variations and hydrological extreme events. To use the mass redistribution products from satellite gravimetry for the rapid monitoring of hydrological extreme events and for hydrological forecasting, the time resolution of these products has recently been increased and in parallel the latency decreased, essentially towards near real-time.

    In this symposium we aim to bring together the satellite gravimetry and other remote sensing techniques with the hydrology community to exploit the near real-time monitoring of water mass changes. We solicit presentations on the latest achievements on generating and assessing near real-time mass redistribution products from GRACE/GRACE-FO, or on using these data for describing hydrological extremes or for early-warning and forecasting applications of extremes and water resources, also including longer time scales such as seasonal forecasts of river discharge and other hydrological variables. Presentations to complement ground-based networks with satellite-based observation methods for near-real time water storage monitoring at large scales, including altimetry, optical or radar data, for instance, are welcome as well.


  • JM01 - Adapting in the Anthropocene (IAMAS, IAHS, IACS)

    Convener: Keith Alverson (USA/Japan, IAMAS)

    Co-Conveners: Gia Destouni (Sweden, IAHS), Michael Wolovick (USA, IACS)



    The detection and attribution of significant human impact on the global environment has been robustly shown across a number of Earth system components. In this context, the concept of planetary boundaries and tipping points has received substantial visibility.  Well known examples include greenhouse gas and aerosol levels in the atmosphere, ice sheet collapse and sea level rise, sea ice loss, plastic and acidification in the ocean, shifts in freshwater availability and quality, and biodiversity loss, nutrient and toxic chemical loading in terrestrial, freshwater and coastal ecosystems. This symposium will highlight examples of where we are experiencing the kind of dominant human impacts on the global environment that define the Anthropocene, with a focus on actions that can be taken to reverse the anthropogenic forcings, reduce their adverse impacts on natural and social systems and provide sustainable services, including food and water security and safety, for a growing and increasingly affluent global human population.


  • JM03 - Advances and Frontier Challenges in Global Monsoon Studies: Dynamics, Convection and Interactions with Hydrological and Land Surface Processes (IAMAS, IAHS)

    Convener: Jianping Li (China, IAMAS)

    Co-Conveners: Andrew Turner (UK, IAMAS), Sumant Nigam (USA, IAMAC), Iracema Cavalcanti (Brazil, IAMAS), E. Hugo Berbery (USA, IAMAC), Kyung-Ja Ha (Korea, IAMAS), Fred Kucharski (Italy, IAMAS), Alesandra Giannini (USA, IAMAS), Serge Janicot (France, IAMAS), Kirsten Thonicke (Germany, IAMAS), Elango Lakshmanan (India, IAHS)



    Advances and frontier challenges in global monsoon studies, including observational, diagnostic, theoretical, modelling and prediction studies of the monsoons and related hydrological processes:

    • Formation, variability and dynamics of the global monsoons from the paleomonsoon to the present day at various time-scales;
    • Linkages with the principal modes of climate variability and related energy and hydrological cycles under a warmer climate;
    • Interactions among monsoons, hydrological cycle, vegetation and land surface processes;
    • Impacts of monsoons on extreme weather and climate events as well as water resources;
    • Predictive skill of the coupled atmosphere-ocean-land system in the monsoon regions; future projection of the monsoons and hydrological cycle under global warming.

    In addition, presentations are also invited on the latest results from monsoon field experiments.


  • JM04 - Hydrometeorologic and Coastal Extremes in Current and Future Climates (IAMAS, IAHS)

    Convener: Laxmi Sushama (Canada, IAMAS)

    Co-Conveners: Marie Ekstrom (UK, IAMAS), Richard Grotjahn (USA, IAMAS), Brian Golding (UK, IAMAS), Abhishekh Srivastava (USA, IAMAS), Hubert Savanije (Netherlands, IAHS), Jai Vaze (Australia, IAHS)



    Extreme hydrometeorologic and coastal events can have devastating impacts on society and cause millions of dollars in damages. Science and engineering is continuously evolving to predict, model and manage these events to reduce their harmful effects. These extremes include localized flooding caused by short duration heavy rainfall to large scale flooding caused by heavy snowmelt combined with ice-jam and rainfall, and coastal flooding due to storm surge. Extreme events are often complex in terms of causal mechanisms and therefore require investigation from a multi-dimensional perspective. Successful management of extreme events demand timely actions on disaster preparedness, early warning, crisis management, response, recovery and clean-up. Advances in understanding these extremes from a multi-dimensional viewpoint, and modeling from both physical and statistical viewpoints, will continue to evolve as new tools and approaches develop and become available.


    This symposium covers hydrometeorologic and coastal extremes in terms of their causal mechanisms, modelling and forecasting, and the adaptation-mitigation-sustainability-resilience nexus. Contributions are invited in the following and related areas:

    • Advances in modelling observed precipitation extremes, floods, droughts, wildland fires, and storm surges;
    • Future evolution, causal mechanisms and forecasting and management of hydrometeorologic and coastal extremes;
    • Hydrometeorologic extremes in relation to developing resilient and sustainable infrastructure.
    • Examples that link physical and socio-economic components of risk exposure and vulnerability.


    Abstracts on topics primarily on meteorological extremes modeling, mechanisms, and forecasting are encouraged for submission to the symposium on High-impact Weather and Climate Extremes (M12).


  • JM06 - Recent Advances in Regional Climate Modelling (IAMAS, IAHS, IACS)

    Convener: Anne Frigon (Canada, IAMAS)

    Co-Conveners: Andrew Orr (UK, IAMAS), Martin Leduc (Canada, IAMAS), René Laprise (Canada, IAMAS), François Brissette (Canada, IAHS), Ross Brown (Canada, IACS)



    This symposium addresses regional climate modelling, looking into recent developments and analyses for both validation and climate-change purposes, based on single model to large ensembles of simulations. We are also interested in analyses that go beyond the typical surface meteorological variables, looking into cryospheric and hydrological fields. Contributions are welcome in the following areas, but not limited to:

    • Validation of models through comparison with observations, using various approaches to diagnose the behavior of the model at different spatial and time scales, as well as looking into feedback mechanisms.
    • Analysis of multi-model ensembles (such as CORDEX) for climate-change studies.
    • Analysis of single model large ensembles.
    • Added value of high-resolution simulations, reaching convection-permitting models.
    • Analyses of large-scale patterns and their links to local-scale impacts.


  • JM07 - Artificial Intelligence and Big data in Weather and Climate Science (IAMAS, IAHS)

    Convener: Philippe Roy (Canada, IAMAS)

    Co-Conveners: Alexis Hannart (Canada, IAMAS), David Hall (USA, IAMAS), Allen Huang (USA, IAMAS), Scott Hosking (UK, IAMAS), Ashish Sharma (Australia, IAHS)



    Rapid advances in artificial intelligence, combined with the availability of enormous amount of data (termed Big Data) is opening new avenues for climate analysis and climate scenarios. The long awaited promises of AI is now common in many disciplines. Applying AI methods, combined with physical knowledge, can improve climate analysis and provide better climate simulations and climate products, notably for high-impact events, such as floods, wildfires and winds.


  • JM08 - Earth System Models: Assessing the Earth System’s State and Fate from Regional to Planetary Scales (IAMAS , IAPSO, IACS, IAHS)

    Convener: Paul Kushner (Canada, IAMAS)

    Co-Conveners: Nathan Gillet (Canada, IAMAS), Marika Holland (USA, IAPSO), Gerhard Krinner (France, IACS), Sophie Nowicki (USA, IACS), Manuela Girotto (USA, IAHS), Stephen Déry (Canada, IAHS)



    Earth System Models provide our principal means to simulate Earth System processes and to predict the evolution of the planet. Each generation of Earth System Models, including components that simulate the atmosphere, oceans, land, vegetation, ice, snow, and the dynamical and biogeochemical processes that link these components, has provided new insights into the workings of the Earth System, predictions from seasonal to decadal scales, and projections of the future of the planet under greenhouse warming and other sources of radiative and compositional driving. These models have progressively simulated finer scales, and through regional refinement or downscaling can be used to investigate regional-scale climate processes and impacts. This symposium encourages contributions dealing with the many facets of Earth System Model development and application, including new modelling results from the Coupled Model Intercomparison Project Phase 6, development and assessment of models making use of recent Earth observations from ground-based and space-based measurements, prediction of climate on seasonal to centennial timescales, climate change detection and attribution, regional-scale climate modelling and process analysis, high resolution climate modelling, and subgrid scale parameterization development. As a joint symposium, submissions on the latest advances in Earth System Modeling across the atmospheric, biogeochemical, oceanic, cryospheric, and hydrological sciences are encouraged.

  • JM09 - Satellite Remote Sensing: Vital Information on the Health of our Planet (IAMAS, IACS, IAPSO, IAHS)

    Convener: Kaley Walker (Canada, IAMAS)

    Co-Conveners: Bojan Bojkov (Germany, IAMAS), Yangbo Chen (China, IAHS), Yasko Kasai (Japan, IAMAS), Paul Kushner (Canada, IACS), Stephen Howell (Canada, IACS), Stefano Vignudelli (Italy, IAPSO), Nicolas Grisouard (Canada, IAPSO), Yanping Li (Canada, IAHS), Hong Lin (Canada, IAMAS)



    Space-based observations provide a unique global perspective on the Earth's atmosphere and surface, including the oceans, land, vegetation, ice, and snow.  Current and planned satellite missions from Canada, and international agencies in US, Europe, China and Japan have provided and will provide a wealth of new information about the Earth system and that can be used to investigate a wide range of environmental and scientific questions.  This symposium encourages contributions dealing with the many facets of space-based remote sensing, including new measurement technologies and techniques, both passive and active; retrieval algorithms; validation of satellite products; assimilation of data into numerical models; scientific results and discoveries and operational utilization and development.

  • JP01 - Tides of the Oceans, Atmosphere, Solid Earth, Lakes and Planets (IAPSO, IAHS, IAMAS, IAG)

    Convener: Philip Woodworth (UK, IAPSO)

    Co-Conveners: Richard Ray (USA, IAPSO), Andreas Richter (Argentina, IAHS), Jean Paul Boy (France, IAG), Jeffrey Forbes (USA, IAMAS)

    Invited speakers: Richard Ray (USA), Brian Arbic (USA), Steven Balbus (UK), Duncan Agnew (USA), Jens Oberheide (USA), Luciano Iess (Italy), Andreas Richter (Argentina)



    The symposium will be open to any aspect of the science or history of the tides of the ocean, solid earth and atmosphere and of lakes and planets. The science will include the present accuracy of coastal, regional and global ocean tide models, tidal dissipation and its role in geophysics, internal tides and their role in mixing the ocean and in the global ocean circulation, secular changes in tides, new techniques for measuring tides and analysing the data, the role of tides in the origin of life on earth and palaeotides. It will also be open to presentations on earth and atmospheric tides, the tides of lakes and planets and many other aspects of tidal science. The symposium will provide a fitting mark of the 100th anniversary of the Liverpool Tidal Institute which led to many advances in tidal science in the 20th century.


  • JP03 - Long-Term Climate Targets: from Emissions to Impacts (IAPSO, IAMAS, IACS, IAHS)

    Conveners: Kirsten Zickfeld (Canada, IAPSO)

    Co-Conveners: Eric Servat (France, IAHS), Ben Marzelon (Germany, IACS), Aimee Slangen (Netherlands, IACS), Nadine Mengis (Canada, IAMAS)



    Long term global temperature and sea level increases are primarily determined by total anthropogenic emissions of carbon dioxide, though shorter-lived greenhouse gas emissions can also leave a long-term warming legacy. Limiting cumulative greenhouse gas emissions by decreasing net emissions to zero is therefore a prerequisite to stabilize long-term global temperatures and slow down sea level rise. Under the Paris Agreement, the world has committed to limiting long term warming to “well below 2°C” (and ideally to 1.5°C) above pre-industrial temperatures, in an attempt to avoid the most dangerous potential impacts of climate change. The scientific challenge is therefore to understand the climate warming legacy of current greenhouse gas emissions, to determine what levels of long term warming and sea level rise would produce unacceptably damaging impacts, and to better quantify the emissions budgets and pathways that would succeed in avoiding these levels of climate change. In this symposium, we welcome contributions on all aspects of this challenge.


    Invited Speakers: Kiya Riverman  (USA), Pietro Milillo  (USA)


  • JS08 - Climate Modeling, Climate Change and Subsurface Temperature Field  (IASPEI, IAHS, IAMAS)

    Convener: Vladimir Cermak (Czech Republic, IASPEI), Makoto Taniguchi (Japan, IAHS)



    Subsurface temperature field reflects time changes in the ground surface conditions, produced by the changing climate in general. On the local scale other events may modify the downward propagation of this “climate” signal, such as e.g. long-term changes in the vegetation cover, land use, urbanization and other human activities. Borehole climatology developed in the past several decades contributed to the reconstructions of the climate of the past several millennia and proved to be a suitable research tool. We want to invite contributions discussing theoretical aspects of borehole temperature inversion methods as well as papers summarizing new practical inversion results obtained on local, regional and global scales. Welcomed are evidences of the repeated measurements of temperature-depth profiles as a useful direct tool to understand the ongoing global warming, various geothermal aspects of the changing climate (heat island effect) in large megapolis as well as urbanization and its global warming impacts.

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